RXYQQ8~20T7Y1B
VRV IV System Air Conditioner
4P345099-1 – 2013.04
Installation and operation manual
17
10.2. Connecting the refrigerant piping
10.2.1. Decide front or side (bottom) connection
Installation of refrigerant piping is possible as front connection or side
connection (when taken out from the bottom) as shown in the figure
below.
For side connections, the knockout hole on the bottom plate
should be removed:
10.2.2. Remove the pinched pipes
Use the following procedure to remove the pinched piping:
1
Remove the valve cover and make sure that the stop valves are
fully closed.
2
Connect the vacuuming/recovery unit to service ports of all stop
valves.
1
Gauge manifold
2
Nitrogen
3
Measuring instrument
4
Refrigerant R410A tank (siphon system)
5
Vacuum pump
6
Charge hose
7
Refrigerant charge port
8
Gas pipe stop valve
9
Liquid pipe stop valve
A
Valve A
B
Valve B
C
Valve C
10
Outdoor unit
11
To indoor unit
12
Stop valve
13
Field piping
14
Gas flow
3
Recover gas and oil from the pinched piping by using a recovery
unit.
4
When all gas and oil is recovered from the pinched piping,
disconnect the charge hose and close the service ports.
5
In case the pinched piping lower part looks like detail A in the
figure below, follow instructions as per procedure steps 7+8.
In case the pinched piping lower part looks like detail B in the
figure below, follow instructions as per procedure steps 6+7+8.
6
For stop valves, cut off the lower part of the smaller pinched
piping with an appropriate tool (e.g., pipe cutter, a pair of
nippers, …). Let the remaining oil drip out in case the recovery
was not complete.
Wait until all oil is dripped out.
NOTICE
Installation shall be done by an installer, the choice of
materials and installation shall comply with the applicable
legislation. In Europe, EN 378 is the applicable standard
that shall be used.
Ensure that the field piping and connections are not
subjected to stress.
NOTICE
Precautions when knocking out knockout holes:
Be sure to avoid damaging the casing.
After knocking out the knockout holes, we recommend
you remove the burrs and paint the edges and areas
around the edges using repair paint to prevent rusting.
When passing electrical wiring through the knockout
holes, wrap the wiring with protective tape to prevent
damage as shown above.
WARNING
Any gas or oil remaining inside the stop valve may blow off
the pinched piping.
Failure to observe the instructions in procedure below
properly may result in property damage or personal injury,
which may be serious depending on the circumstances.
1
Left-side connection
2
Front connection
3
Right-side connection
1
2
3
1
Large knockout hole
2
Drill
3
Points for drilling
3
2
1
1
Service port and service
port cover
2
Stop valve
3
Field piping connection
4
Stop valve cover
3
4
1
2
CAUTION
Do not vent gases into the atmosphere.
13
9
1
2
4
3
5
7
14
6
12
10
8
C
B
A
11
1
Pinched piping
2
Stop valve
3
Service port
4
Point of melting the brazing
metal; cut pipe off just above
this brazing or marking point
B
A
3
2
4
1
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